plugins/sid/voice.h

   1 //  ---------------------------------------------------------------------------
   2 //  This file is part of reSID, a MOS6581 SID emulator engine.
   3 //  Copyright (C) 2004  Dag Lem <resid@nimrod.no>
   4 //
   5 //  This program is free software; you can redistribute it and/or modify
   6 //  it under the terms of the GNU General Public License as published by
   7 //  the Free Software Foundation; either version 2 of the License, or
   8 //  (at your option) any later version.
   9 //
  10 //  This program is distributed in the hope that it will be useful,
  11 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 //  GNU General Public License for more details.
  14 //
  15 //  You should have received a copy of the GNU General Public License
  16 //  along with this program; if not, write to the Free Software
  17 //  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 //  ---------------------------------------------------------------------------
  19
  20 #ifndef __VOICE_H__
  21 #define __VOICE_H__
  22
  23 #include "siddefs.h"
  24 #include "wave.h"
  25 #include "envelope.h"
  26
  27 class Voice
  28 {
  29 public:
  30   Voice();
  31
  32   void set_chip_model(chip_model model);
  33   void set_sync_source(Voice*);
  34   void reset();
  35
  36   void writeCONTROL_REG(reg8);
  37
  38   // Amplitude modulated waveform output.
  39   // Range [-2048*255, 2047*255].
  40   RESID_INLINE sound_sample output();
  41
  42 protected:
  43   WaveformGenerator wave;
  44   EnvelopeGenerator envelope;
  45
  46   // Waveform D/A zero level.
  47   sound_sample wave_zero;
  48
  49   // Multiplying D/A DC offset.
  50   sound_sample voice_DC;
  51
  52 friend class cSID;
  53 };
  54
  55
  56 // ----------------------------------------------------------------------------
  57 // Inline functions.
  58 // The following function is defined inline because it is called every
  59 // time a sample is calculated.
  60 // ----------------------------------------------------------------------------
  61
  62 #if RESID_INLINING || defined(__VOICE_CC__)
  63
  64 // ----------------------------------------------------------------------------
  65 // Amplitude modulated waveform output.
  66 // Ideal range [-2048*255, 2047*255].
  67 // ----------------------------------------------------------------------------
  68 RESID_INLINE
  69 sound_sample Voice::output()
  70 {
  71   // Multiply oscillator output with envelope output.
  72   return (wave.output() - wave_zero)*envelope.output() + voice_DC;
  73 }
  74
  75 #endif // RESID_INLINING || defined(__VOICE_CC__)
  76
  77 #endif // not __VOICE_H__